A circle can have a unit of length which could be either a measure of its diameter or radius, or of its circumference. Or the circle could have the unit of area.
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If the radius is two. it won't be a unit circle, a unit circle is defined as a circle with radius one.
The unit circle is a circle with its center at the origin and a radius of ' 1 '.
A unit circle is a circle with radius equal to one.
unit in earth science used for measuring angles in a circle or sphere?
Look on a unit circle graph and see what kind of pi it has. For example 90 degrees is pi/2